Minimalist wallpapers centered around a single color and a key signature noted in its middle.

The colors were chosen carefully (to not be hard on the eyes) with HSV all in multiples of thirteen (heh), and the major-keys are written in German / Polish as according to this article: http://blog-en.blechaczinfo.com/2012/02/two-interviews-with-blechacz-from.html

Rafal Blechacz is an amazing pianist. If you like classical music, he's worth a listen or two or three million.